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Cheap flights from St. Louis to Sofia from $558

This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 1/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:30 am - 1:50 pm
STL
-
SOF
23h 20m2 stops
United Airlines Logo
6:10 am - 10:00 pm
SOF
-
STL
23h 50m2 stops
$558United Airlines
Thu, Jan 29 - Mon, Feb 2
Lufthansa Logo
6:40 pm - 6:20 pm
STL
-
SOF
15h 40m2 stops
Lufthansa Logo
6:00 am - 5:43 pm
SOF
-
STL
19h 43m2 stops
$679Lufthansa
Sun, Jan 11 - Tue, Jan 27
Lufthansa Logo
3:50 pm - 1:35 pm
STL
-
SOF
13h 45m1 stop
Lufthansa Logo
6:00 am - 5:43 pm
SOF
-
STL
19h 43m2 stops
$690Lufthansa
Sun, Jan 11 - Tue, Jan 27
Lufthansa Logo
3:50 pm - 1:35 pm
STL
-
SOF
13h 45m1 stop
Lufthansa Logo
2:15 pm - 1:55 pm
SOF
-
STL
31h 40m1 stop
$714Lufthansa
Sun, Jan 11 - Tue, Jan 27
Multiple Airlines Logo
4:05 pm - 1:25 pm
STL
-
SOF
37h 20m2 stops
Multiple Airlines Logo
6:00 am - 5:43 pm
SOF
-
STL
19h 43m3 stops
$1,111Multiple Airlines
Sun, Jan 11 - Tue, Jan 27
Air Canada Logo
9:57 am - 6:20 pm
STL
-
SOF
24h 23m3 stops
Air Canada Logo
6:00 am - 5:43 pm
SOF
-
STL
19h 43m3 stops
$1,379Air Canada
Sun, Jan 11 - Tue, Jan 27

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets
Lufthansa
Jan 11
STL6:40 pmLambert-St Louis
15h 40m
2 stops
SOF6:20 pmSofia
Jan 27
SOF6:00 amSofia
19h 43m
2 stops
STL5:43 pmLambert-St Louis
$679
Find similar
Lufthansa
Jan 11
STL3:50 pmLambert-St Louis
13h 45m
1 stop
SOF1:35 pmSofia
Jan 27
SOF6:00 amSofia
19h 43m
2 stops
STL5:43 pmLambert-St Louis
$690
Find similar
Lufthansa
Jan 11
STL3:50 pmLambert-St Louis
13h 45m
1 stop
SOF1:35 pmSofia
Jan 27
SOF2:15 pmSofia
31h 40m
1 stop
STL1:55 pmLambert-St Louis
$714
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 29, 2025.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Thu 1/29

6:30 am-1:50 pm

2 stops23h 20m

Sofia

Mon 2/2

6:10 am-10:00 pm

2 stops23h 50m

$558

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 1/11

6:40 pm-6:20 pm

2 stops15h 40m

Sofia

Tue 1/27

6:00 am-5:43 pm

2 stops19h 43m

$679

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 1/11

3:50 pm-1:35 pm

1 stop13h 45m

Sofia

Tue 1/27

6:00 am-5:43 pm

2 stops19h 43m

$690

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 1/11

3:50 pm-1:35 pm

1 stop13h 45m

Sofia

Tue 1/27

2:15 pm-1:55 pm

1 stop31h 40m

$714

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 1/11

4:05 pm-1:25 pm

2 stops37h 20m

Sofia

Tue 1/27

6:00 am-5:43 pm

3 stops19h 43m

$1,111

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 1/11

9:57 am-6:20 pm

3 stops24h 23m

Sofia

Tue 1/27

6:00 am-5:43 pm

3 stops19h 43m

$1,379

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

How far in advance should I book a flight to Sofia?

You are more likely to see cheaper flights to Sofia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sofia for around $904 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sofia from St. Louis for as low as $799 on momondo.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 17% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

23h 20m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 23h 20m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 23h 20m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
LufthansaPriceFrom $645Free CancellationRating
6.8
7,659 reviews
Search Lufthansa flights
United AirlinesPriceFrom $721Free CancellationRating
7.4
9,118 reviews
Search United Airlines flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Lufthansa
United Airlines